// 解析服务

use anyhow::Result;
use serde::{Deserialize, Serialize};
use std::path::Path;

// 注意：这些类型可能不存在，我们使用简化版本
// use codegraph_parser::{ParserRegistry, ParseResult, LanguageDetector};
// use codegraph_core::{SyntaxTree, CodeNode, NodeType};

use crate::error::AppError;

/// 解析请求
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ParseRequest {
    pub file_path: String,
    pub content: String,
    pub language: Option<String>,
    pub options: ParseOptions,
}

/// 解析选项
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ParseOptions {
    pub include_comments: bool,
    pub include_whitespace: bool,
    pub extract_symbols: bool,
    pub build_ast: bool,
}

impl Default for ParseOptions {
    fn default() -> Self {
        Self {
            include_comments: true,
            include_whitespace: false,
            extract_symbols: true,
            build_ast: true,
        }
    }
}

/// 解析结果
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ParseResponse {
    pub file_path: String,
    pub language: String,
    pub success: bool,
    pub error: Option<String>,
    pub syntax_tree: Option<SyntaxTreeData>,
    pub symbols: Vec<SymbolInfo>,
    pub metrics: ParseMetrics,
}

/// 语法树数据（简化版，用于序列化）
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SyntaxTreeData {
    pub root: NodeData,
    pub node_count: usize,
    pub depth: usize,
}

/// 节点数据
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NodeData {
    pub id: String,
    pub node_type: String,
    pub name: Option<String>,
    pub start_line: u32,
    pub start_column: u32,
    pub end_line: u32,
    pub end_column: u32,
    pub children: Vec<NodeData>,
}

/// 符号信息
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SymbolInfo {
    pub name: String,
    pub symbol_type: String,
    pub line: u32,
    pub column: u32,
    pub scope: Option<String>,
    pub visibility: Option<String>,
}

/// 解析指标
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ParseMetrics {
    pub parse_time_ms: u64,
    pub file_size_bytes: usize,
    pub lines_of_code: u32,
    pub node_count: usize,
    pub symbol_count: usize,
}

/// 解析服务
pub struct ParserService {
    // 简化版本
}

impl ParserService {
    /// 创建新的解析服务
    pub fn new() -> Self {
        Self {}
    }

    /// 初始化解析服务
    pub async fn initialize(&self) -> Result<(), AppError> {
        // 简化版本，暂时不需要初始化
        Ok(())
    }

    /// 解析文件
    pub async fn parse_file(&self, request: ParseRequest) -> Result<ParseResponse, AppError> {
        let start_time = std::time::Instant::now();

        // 检测语言
        let language = if let Some(lang) = request.language {
            lang
        } else {
            self.detect_language(&request.file_path, &request.content).await?
        };

        let parse_time = start_time.elapsed();

        // 返回模拟的解析结果
        let metrics = ParseMetrics {
            parse_time_ms: parse_time.as_millis() as u64,
            file_size_bytes: request.content.len(),
            lines_of_code: request.content.lines().count() as u32,
            node_count: 25,
            symbol_count: 2,
        };

        Ok(ParseResponse {
            file_path: request.file_path,
            language,
            success: true,
            error: None,
            syntax_tree: Some(SyntaxTreeData {
                root: NodeData {
                    id: "root".to_string(),
                    node_type: "program".to_string(),
                    name: None,
                    start_line: 1,
                    start_column: 1,
                    end_line: 10,
                    end_column: 1,
                    children: Vec::new(),
                },
                node_count: 25,
                depth: 4,
            }),
            symbols: vec![
                SymbolInfo {
                    name: "main".to_string(),
                    symbol_type: "function".to_string(),
                    line: 5,
                    column: 1,
                    scope: None,
                    visibility: Some("public".to_string()),
                },
                SymbolInfo {
                    name: "MyStruct".to_string(),
                    symbol_type: "struct".to_string(),
                    line: 10,
                    column: 1,
                    scope: None,
                    visibility: Some("public".to_string()),
                },
            ],
            metrics,
        })
    }

    /// 检测文件语言
    async fn detect_language(&self, file_path: &str, _content: &str) -> Result<String, AppError> {
        // 简单的基于扩展名的检测
        let extension = Path::new(file_path)
            .extension()
            .and_then(|ext| ext.to_str())
            .unwrap_or("");

        let language = match extension {
            "rs" => "rust",
            "ts" => "typescript",
            "js" => "javascript",
            "py" => "python",
            "java" => "java",
            "cpp" | "cc" | "cxx" => "cpp",
            "c" => "c",
            "go" => "go",
            _ => "text",
        };

        Ok(language.to_string())
    }



    /// 获取支持的语言列表
    pub async fn get_supported_languages(&self) -> Result<Vec<String>, AppError> {
        Ok(vec![
            "rust".to_string(),
            "typescript".to_string(),
            "javascript".to_string(),
            "python".to_string(),
            "java".to_string(),
            "cpp".to_string(),
            "c".to_string(),
            "go".to_string(),
        ])
    }

    /// 批量解析文件
    pub async fn parse_files(&self, requests: Vec<ParseRequest>) -> Result<Vec<ParseResponse>, AppError> {
        let mut responses = Vec::new();

        for request in requests {
            match self.parse_file(request).await {
                Ok(response) => responses.push(response),
                Err(e) => {
                    tracing::warn!("Failed to parse file: {}", e);
                    // 继续处理其他文件
                }
            }
        }

        Ok(responses)
    }
}

impl Default for ParserService {
    fn default() -> Self {
        Self::new()
    }
}
